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Capsicum Carotenoids

Capsanthin and capsorubin are red carotenoid pigments unique to Capsicum peppers (red peppers, paprika, chili). They are potent inhibitors of P-glycoprotein (P-gp), which may enhance bioavailability of other supplements and drugs that are P-gp substrates. Unlike beta-carotene, these carotenoids lack vitamin A activity. Limited research exists - primarily in vitro studies on transport protein inhibition. May have antioxidant properties typical of carotenoids. Not a priority supplement target due to limited evidence.

Quick Answer

What it is

Capsanthin and capsorubin are red carotenoid pigments unique to Capsicum peppers (red peppers, paprika, chili). They are potent inhibitors of P-glycoprotein (P-gp), which may enhance bioavailability of other supplements and drugs that are P-gp substrates.

Key findings

  • Grade D: Antioxidant Activity
  • Grade D: LDL Oxidation
  • Grade D: Drug and Supplement Bioavailability Enhancement

Safety

No specific caution or interaction language was detected in the current summary/outcome notes.

ℹ️ Quick Facts: Capsicum Carotenoids

Quick Facts: Capsicum Carotenoids

  • Best Evidence:Grade D
  • Conditions Studied:2
  • Research Outcomes:5
  • Key Effect:Antioxidant Status
Outcomes by grade:
A0
B0
C0
D5
2 conditions · 5 outcomes

Detailed Outcomes

|
D
Antioxidant Activity
In cell-free and chemical oxidation assays, capsanthin and capsorubin demonstrate strong antioxidant activity, scavenging superoxide anion, hydroxyl radical, and singlet oxygen. Capsorubin shows greater oxidative stability than capsanthin, and both are markedly more resistant to free radical degradation than beta-carotene or yellow xanthophylls. A 2021 review confirms these carotenoids are detectable in human red blood cells after dietary paprika intake, though oral bioavailability from paprika oleoresin is low.
moderate↑Improves
D
LDL Oxidation
In vitro, paprika carotenoids efficiently suppressed copper-catalyzed oxidation of human blood LDL particles, inhibiting conjugated diene formation and blocking conversion of cholesterol into atherogenic products including 5,6-epoxycholesterol and 7-ketocholesterol. Also reduced formation of small dense LDL subfractions. No human intervention trials have tested this effect in vivo.
moderate↓Improves
D
Drug and Supplement Bioavailability Enhancement
In cell-based transport models, capsicum carotenoids potently inhibit P-glycoprotein (P-gp), multidrug resistance-associated protein (MRP), and breast cancer resistance protein (BCRP) transporters. This suggests co-administration could increase absorption and reduce clearance of drugs and supplements that are substrates of these efflux pumps. However, a human study in 9 volunteers found very low oral bioavailability of capsanthin and capsorubin themselves from paprika oleoresin, which limits practical relevance.
moderate↑Improves
D
UV-Induced Skin DNA Damage
In cultured human dermal fibroblasts, pretreatment with capsanthin or capsorubin significantly decreased DNA strand breaks following UVB exposure (0-300 mJ/cm2), counteracted UVB-induced cytotoxicity, and reduced caspase-3 cleavage (a marker of UV-triggered apoptosis). Photoprotective potency was comparable to lutein. No human clinical trials exist.
moderate↓Improves
D
Cancer Cell Drug Resistance Reversal
In mouse lymphoma and human breast cancer cell lines, capsanthin and capsorubin enhanced rhodamine 123 accumulation 30-fold in multidrug-resistant cells, indicating potent reversal of P-glycoprotein-mediated drug efflux. Capsanthin also induced apoptosis in these cancer cell lines. These findings are strictly in vitro with no animal or human confirmation.
large↓Worsens

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